Hello.
First of all, if you look at the window in the upper left corner of matlab, there is a Workspace option. Only things placed in it can be displayed.
So, you have to do 3 things.
1. Put automn.gif in the current directory. It's in the folder written above in matlab.
2. Put autumn.gif into the workspace and name it x
x=imread('autumn.gif');
3. Display x
imshow(x);
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If it is a black and white image, there should be no problem. If it is a color image, could you please add more questions:)